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Tersus GNSS has launched the AG993, a modular autosteer retrofit kit for agricultural vehicles that combines high-precision GNSS positioning with the company’s proprietary Tersus Advanced Positioning (TAP) satellite correction service and conventional RTK support.
The system is designed to deliver better than 2.5 cm positioning accuracy across a working speed range of 0.2 to 30 km/h, with support for speeds as low as 0.1 km/h. It also includes automatic headland U-turn functionality.
A key feature of the AG993 is TAP, which delivers correction data via L-band satellite signals instead of relying on a local base station or cellular network. If an RTK correction signal is interrupted, the system’s TAPFill function automatically switches to TAP while maintaining the RTK coordinate reference frame to provide uninterrupted guidance. If GNSS signals are lost or positioning quality falls below an acceptable threshold, the system alerts the operator and requires manual confirmation before autosteer operation can resume.
The AG993 includes the GC30 Guidance Controller, a 10.1-inch IP67-rated TC120 tablet terminal, the TES30 electric steering motor, a camera and vehicle-specific mounting brackets. According to Tersus, the kit is compatible with more than 90% of agricultural vehicles across multiple brands. The company recommends installation by trained personnel or authorized dealers.
The system supports GPS, GLONASS, Galileo, BeiDou (BDS-3), QZSS, SBAS and IRNSS, as well as the L-band TAP correction signal.
Tersus is also developing an integration path for the AgOpenGPS community alongside its commercial offering. The company said the approach is intended to combine its GNSS/INS fusion and motor-control hardware with community-developed software. ISOBUS VT and Task Controller compatibility, section control for sprayers and seed drills, and a 12-inch tablet option are currently under development.
The AG993 is expected to retail for approximately $4,000 to $8,000, depending on dealer, region and system configuration.
Mark Chen, director of digital media at Tersus, said the AG993 represents a step toward more autonomous agricultural operations. He pointed to future capabilities including ISOBUS Tractor Implement Management, multi-sensor fusion using cameras, lidar radar and IMUs for obstacle detection, integration with farm management platforms such as John Deere Operations Center and agrirouter, and compliance with evolving European regulatory and cybersecurity requirements.
